I'm currently doing the same on a world models 1/6th cub.I will put the rx on a little shelf glued to the right inside below the windows.The rx will be attached to the shelf with velcro.I will make a small hole in the side to feed 1 aerial through,with the other pointing straight down to the bottom of the fuse.Apparently,having the 2 aerials at 90 degrees to each other is the most important.If you have the single aerial rx,I wouldn't worry unless the fuse was fibreglass.